Origin of the formation of the 4‐butenyl end group in zirconocene‐catalyzed propylene polymerization | Zendy

QuevedoSanchez Bernabe | Zendy; Henson Michael A. | Zendy; Coughlin E. Bryan | Zendy

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Origin of the formation of the 4‐butenyl end group in zirconocene‐catalyzed propylene polymerization

Author(s) -

QuevedoSanchez Bernabe,

Henson Michael A.,

Coughlin E. Bryan

Publication year - 2006

Publication title -

journal of polymer science part a: polymer chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.768

H-Index - 152

eISSN - 1099-0518

pISSN - 0887-624X

DOI - 10.1002/pola.21460

Subject(s) - isomerization , tacticity , hydride , chemistry , polymer chemistry , catalysis , polymerization , group (periodic table) , photochemistry , polymer , medicinal chemistry , organic chemistry , metal

It has been proposed that the 4‐butenyl end group in polypropylene is formed by isomerization of the 2‐butenyl end group. Prior experimental evidence has shown that the isomerization is not produced thermally or upon an acidic treatment during the workup or analysis of the polymer. We postulate that the production of the 4‐butenyl end group by isomerization might be catalyzed by a zirconocene hydride complex that forms during the β‐hydride elimination reaction. The isomerization of a preformed olefinic‐end‐group isotactic polypropylene with a well‐known transition‐metal hydride shows the disappearance of the 2‐butenyl end group concomitant with the appearance of the 4‐butenyl end group.

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